hormone replacement therapy vs HRT

hormone replacement therapy and HRT both are nouns.

Word	Noun	Adjective	Verb	Adverb
hormone replacement therapy	Yes	No	No	No
HRT	Yes	No	No	No

As nouns, hormone replacement therapy and HRT are synonyms defined as:

hormone replacement therapy and HRT: hormones (estrogen and progestin) are given to postmenopausal women; believed to protect them from heart disease and osteoporosis

Other synonyms of hormone replacement therapy include hormone-replacement therapy.

hormone replacement therapy (noun)	HRT (noun)
hormones (estrogen and progestin) are given to postmenopausal women; believed to protect them from heart disease and osteoporosis	hormones (estrogen and progestin) are given to postmenopausal women; believed to protect them from heart disease and osteoporosis